Looking for free SaaS calculators and marketing tools? This is the complete list of free tools built for SaaS founders, marketers, and indie hackers. All tools run 100% in your browser — no sign-up, no data collection.
Why Free Calculators Beat Blog Posts
Most tool review blogs say the same thing. But when you search for "ROAS calculator" or "LTV:CAC ratio," you don't want a 2,000-word essay — you want to type in your numbers and get an answer.
That's why we built 30+ free calculators and tools. Each one solves a specific problem in under 10 seconds.
Revenue & Metrics Calculators
- SaaS Revenue Calculator — MRR, ARR, runway, and growth rate in one dashboard
- MRR Growth Calculator — Month-over-month growth with CAGR and forward projections
- CAC Calculator — Customer acquisition cost with payback period analysis
- Churn Rate Calculator — Monthly churn with revenue impact and LTV estimate
- LTV:CAC Calculator — The magic ratio every SaaS founder needs to track
- SaaS CLV Calculator — Customer lifetime value with margin adjustment
Marketing & Ads Calculators
- ROAS Calculator — Return on ad spend with break-even analysis by industry
- ROI Calculator — General-purpose ROI with timeline and annualized return
- Conversion Rate Calculator — A/B test significance checker
- Email Open Rate Calculator — Benchmark against industry averages
- Profit Margin Calculator — Gross vs net margin breakdown
- CPM Calculator — Ad cost per thousand impressions
- Cold Email ROI Calculator — Campaign ROI with reply rate and conversion inputs
- Cold Email Reply Rate Calculator — Benchmark and forecast reply rates
AI & Developer Tools
- AI Content ROI Calculator — Are your ChatGPT/Claude/Cursor subscriptions actually worth it?
- Real Tool Cost Calculator — Total cost of ownership across your SaaS stack
- Tool Cost Comparison Calculator — Side-by-side pricing comparison
- Stripe MCP Config Validator — Paste your MCP JSON, detect secret-key leaks before you deploy
- UTM Link Builder — Campaign URL builder with presets
- SEO Content Score Calculator — Content quality scoring against SEO best practices
E-commerce & Amazon Tools
- Amazon FBA Profit Calculator — Fee breakdown and profit per unit
Tool Reviews & Comparisons
Comparison pages are the highest-converting content we've built. When someone searches "Jasper vs Copy.ai," they're ready to buy — and a side-by-side breakdown converts 3-4x better than a calculator.
Cold Email Tools
- Smartlead Review | Instantly Review | Lemlist Review
- Smartlead vs Instantly | Lemlist vs Instantly | Lemlist vs Smartlead
AI Writing Tools
- Jasper Review | Copy.ai Review | Writesonic Review
- Jasper vs Copy.ai | Jasper vs Writesonic | Copy.ai vs Writesonic
SEO Tools
- Ahrefs Review | Semrush Review | Surfer SEO Review
- Ahrefs vs Semrush | Ahrefs vs Surfer SEO | Semrush vs Surfer SEO
Amazon Seller Tools
- Helium 10 Review | Jungle Scout Review | SellerApp Review
- Helium 10 vs SellerApp | Jungle Scout vs Helium 10 | Jungle Scout vs SellerApp
AI Video Tools
- Pika Review | Runway Review | Synthesia Review
- Pika vs Synthesia | Runway vs Pika | Runway vs Synthesia
Deep-Dive Reports
- AI Writing Tool Value Report 2026 — Data-driven analysis of which AI writing tools actually deliver ROI
- Cold Email Tool Pitfall Guide — Common mistakes and how to avoid them
Industry Benchmarks & Resources
- SaaS Metrics Industry Statistics — 54 source-linked benchmarks for churn, CAC, LTV:CAC, and growth rates
- Best AI Writing Tools — Curated comparison with real user review data
- Notion Templates — Premium templates for SaaS founders
Key Stats
- 30+ free tools — All running 100% in your browser
- 15 detailed reviews — Cold email, AI writing, SEO, Amazon, AI video
- 15 comparison pages — Side-by-side breakdowns with real pricing
- 54 benchmark statistics — Source-linked from OpenView, ChartMogul, Bessemer
- No sign-up required — No data collection, no email wall
FAQ
Q: Are these tools really free? A: Yes. All calculators and tools are completely free. We make money through affiliate links on review pages and a few premium templates.
Q: Do I need to create an account? A: No. Every tool runs locally in your browser. Your data never leaves your device.
Q: How often are new tools added? A: We add 1-2 new tools per month. Subscribe to our newsletter to get notified.
Q: Are the reviews unbiased? A: Yes. We test every tool we review and publish transparent limitations alongside benefits. Affiliate relationships never affect our ratings.
Disclosure: This contains affiliate links. If you sign up through these links, we may earn a commission at no extra cost to you.
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